Thrown if trying to access an index which is out of bounds on objects like String, Array, or Vector. Any negative integer less than or equal to -1 and positive integer greater than or equal to the size of the object is an index which would be out of bounds

java.lang.IndexOutOfBoundsException: Index: 2, Size: 2 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at org.antlr.intellij.plugin.preview.ShowAmbigTreesDialog.setTrees(ShowAmbigTreesDialog.java:308) at org.antlr.intellij.plugin.preview.ShowAmbigTreesDialog.popupAmbigTreesDialog(ShowAmbigTreesDialog.java:135) at org.antlr.intellij.plugin.preview.ShowAmbigTreesDialog$3.run(ShowAmbigTreesDialog.java:92) at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:199) at com.intellij.ui.popup.AbstractPopup.a(AbstractPopup.java:1390) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at com.intellij.ide.IdeEventQueue.f(IdeEventQueue.java:863) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:699) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:385) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)